import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,5))
r=w0.workplane(offset=-37/2).moveTo(27.5,0).box(45,34,37).union(w0.sketch().arc((-32,12),(-49,-1),(-28,7)).arc((-33,8),(-32,12)).assemble().finalize().extrude(27))